Vulnerability · Published Dec 30, 2021 · Assigned by @huntrdev
CVE-2021-4188NULL Pointer Dereference in mruby/mruby
Medium 6.8
In plain English
A medium-severity null pointer dereference in mruby/mruby from mruby. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.0)6.8Medium
Exploit odds (30 days)0.9%top 40.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
mruby is vulnerable to NULL Pointer Dereference
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | mruby | 3.1.0-r0 | ALPINE-CVE-2021-4188 |
| Alpine:v3.21 | mruby | 3.1.0-r0 | ALPINE-CVE-2021-4188 |
| Alpine:v3.22 | mruby | 3.1.0-r0 | ALPINE-CVE-2021-4188 |
| Alpine:v3.23 | mruby | 3.1.0-r0 | ALPINE-CVE-2021-4188 |
| Alpine:v3.24 | mruby | 3.1.0-r0 | ALPINE-CVE-2021-4188 |
| Ubuntu:22.04:LTS | mruby | no fix listed | UBUNTU-CVE-2021-4188 |
| Ubuntu:24.04:LTS | mruby | no fix listed | UBUNTU-CVE-2021-4188 |
| Ubuntu:25.10 | mruby | no fix listed | UBUNTU-CVE-2021-4188 |
| Ubuntu:26.04:LTS | mruby | no fix listed | UBUNTU-CVE-2021-4188 |
| Ubuntu:26.10 | mruby | no fix listed | UBUNTU-CVE-2021-4188 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mruby | mruby/mruby | unspecified – before 3.1 |
Weakness: CWE-476 · Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
References
- https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28 x_refsource_CONFIRM
- https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8 x_refsource_MISC